Fig. 12 in The popular model annelid Enchytraeus albidus is only one species in a complex of seashore white worms (Clitellata, Enchytraeidae)

Fig. 12 Enchytraeus cf. krumbachi a vas deferens, showing the transition between the thin- and thick-walled portions; note the lack of cilia inside the thick-walled part. b Male copulatory apparatus. c Spermatheca. ag accessory gland, ed ectal duct, eg ectal gland, pb penial bulb, sa spermathecal ampulla, sm sperm, vd vas deferens. Scale bars 100 μm